Ausgaben mit FCGI richtig codieren

[mfinanz.git] / SL / FCGIFixes.pm

diff --git a/SL/FCGIFixes.pm b/SL/FCGIFixes.pm
new file mode 100644 (file)
index 0000000..2bd312c
--- /dev/null
+++ b/SL/FCGIFixes.pm
@@ -0,0 +1,48 @@
+package SL::FCGIFixes;
+
+use strict;
+
+use Encode;
+use FCGI;
+
+# FCGI does not use Perl's I/O layer. Therefore it does not honor
+# setting STDOUT to ":utf8" with "binmode".  Also FCGI starting with
+# 0.69 implements proper handling for UTF-8 flagged strings -- namely
+# by downgrading them into bytes. The combination of the two causes
+# Lx-Office's way of handling strings to go belly up (storing
+# everything in Perl's internal encoding and using Perl's I/O layer
+# for automatic conversion on output).
+#
+# This workaround monkeypatches FCGI's print routine so that all of
+# its arguments safe for "$self" are encoded into UTF-8 before calling
+# FCGI's original PRINT function.
+#
+# However, this must not be done if raw I/O is requested -- e.g. when
+# sending out binary data. Fortunately that has been centralized via
+# Locale's "with_raw_io" function which sets a variable indicating
+# that current I/O operations should be raw.
+
+sub fix_print_and_internal_encoding_after_0_68 {
+  return if version->parse($FCGI::VERSION) <= version->parse("0.68");
+
+  my $encoder             = Encode::find_encoding('UTF-8');
+  my $original_fcgi_print = \&FCGI::Stream::PRINT;
+
+  no warnings 'redefine';
+
+  *FCGI::Stream::PRINT = sub {
+    if (!$::locale || !$::locale->raw_io_active) {
+      my $self = shift;
+      my @vals = map { $encoder->encode($_, Encode::FB_CROAK|Encode::LEAVE_SRC) } @_;
+      @_ = ($self, @vals);
+    }
+
+    goto $original_fcgi_print;
+  };
+}
+
+sub apply_fixes {
+  fix_print_and_internal_encoding_after_0_68();
+}
+
+1;